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[Qemu-devel] Re: [PATCH +stable] block: don't attempt to merge overlappi

From: Avi Kivity
Subject: [Qemu-devel] Re: [PATCH +stable] block: don't attempt to merge overlapping requests
Date: Wed, 19 May 2010 11:09:07 +0300
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20100330 Fedora/3.0.4-1.fc12 Thunderbird/3.0.4

On 05/18/2010 10:22 PM, Stefan Hajnoczi wrote:
On Tue, May 18, 2010 at 6:18 PM, Avi Kivity<address@hidden>  wrote:
The block multiwrite code pretends to be able to merge overlapping requests,
but doesn't do so in fact.  This leads to I/O errors (for example on mkfs
of a large virtio disk).
Are overlapping write requests correct guest behavior?  I thought the
ordering semantics require a flush between overlapping writes to
ensure A is written before B.

What cache= mode are you running?


Do not meddle in the internals of kernels, for they are subtle and quick to 

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